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Extrusion-without-leaving-billet processing method of nonferrous metal section bars

A technology of extrusion processing and profile, which is applied in the field of metal material processing, can solve the problems of shrinking, reducing the mold split ratio, and large temperature rise

Inactive Publication Date: 2017-05-24
ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Retaining the extrusion residue (residue) has a great influence on the extrusion tooling, extrusion process and extrusion product quality: (1) The feed hole of the die must be smaller than the diameter of the extrusion barrel; (2) The short rod cannot be guaranteed The impurities carried by the billet remain completely in the extrusion residue; (3) narrowing the feed hole of the die directly leads to high extrusion pressure (large power consumption of the extruder) and the temperature rise of the extruded billet in the extrusion process in the barrel (4) Reducing the feed hole of the mold reduces the split ratio of the mold accordingly, the hydrostatic pressure in the mold cavity is low, and the welding of the material is not good, and it is easy to produce obvious welding lines of the profile

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] For a hollow structure AZ31 magnesium alloy profile, its wall thickness is 3.5mm, the diameter of the outer sectional circle is φ82mm, and the length of the cut-to-length is 5000mm.

[0015] AZ31 magnesium alloy semi-continuous casting rods with a diameter of 178mm and a length of 5-6m are homogenized and sent to the long rod heating furnace, heated to 420-450°C after 4-5h, and cut at the outlet of the long rod heating furnace The short rod blanks required for extrusion with a length of 400-600mm enter the thermal peeling machine through the slideway mechanism, and after thermal peeling by the pouring cutter of the peeling machine, the obtained rods with bright and clean surfaces are directly sent to the machine through the feeding mechanism. Enter the 1650-ton extruder to extrude the barrel, adopt the secondary fusion die (front-end die), extrude at high temperature, and repeat the above-mentioned actions for the subsequent bars to realize the pressure-free extrusion pr...

Embodiment 2

[0017] For a TC4 titanium alloy pipe, the thickness of the wall is 6mm, the diameter of the outer cut circle is φ226mm, and the length of the cut-to-length is 4000mm.

[0018] The TC4 titanium alloy long bar with a diameter of 178mm and a length of 5-6m is homogenized and then sent into the heating furnace, heated to 900-950°C for 5-6h, and cut into lengths at the discharge port of the long bar heating furnace. Press the required short rod blank, enter the peeling machine through the slideway, and after peeling by the pouring knife of the thermal peeling machine, the obtained rod with bright and clean surface is directly sent into the extrusion barrel through the feeding mechanism, and the secondary fusion mold ( Front-end die) high-temperature extrusion forming, and the subsequent bar material repeats the above actions to realize the extrusion processing of profile products without excess pressure.

Embodiment 3

[0020] For a hollow structure 6082 aluminum alloy profile, its wall thickness is 3mm, the diameter of the outer truncated circle is φ156mm, and the fixed length is 4000mm

[0021] The 6082 aluminum alloy semi-continuous casting bar with a diameter of 178mm and a length of 5-6m is homogenized and sent to the long rod heating furnace, heated to 450-500°C for 5-6h, and cut at the outlet of the long rod heating furnace The extruded short rod blank with a length of 400-600mm enters the peeling machine through the slideway, and after being thermally peeled by the pouring cutter of the peeling machine, the rod with a bright and clean surface is obtained, and is directly sent into the extrusion barrel through the feeding mechanism. The high-temperature extrusion molding of the secondary fusion mold (front-type mold) is adopted, and the above-mentioned actions are repeated for subsequent bars to realize extrusion processing of profile products without any impurities.

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Abstract

An extrusion-without-leaving-billet processing method of nonferrous metal section bars comprises the following steps: long rod thermal shearing, thermal peeling and prepositioned die extrusion. The method overcomes the influences of secondary pollution of the surfaces of short rods and the secondary generation of oxide skins on the performances and the quality of section bars after extrusion processing, caused by cold sawed saw kerf loss, cold turning, manual carrying and heating processes, shortens the extrusion time, increases the extrusion efficiency, reduces the processing cost of magnesium alloy, aluminum alloy and titanium alloy section bars, reduces the energy consumption and the material loss, saves electric energy, and obviously increases the economic benefit.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, in particular to the extrusion forming processing of non-ferrous metal profiles such as aluminum alloy, magnesium alloy and titanium alloy. Background technique [0002] Aluminum alloy, magnesium alloy, titanium alloy and other lightweight non-ferrous alloy materials have many advantages such as high specific strength, high specific modulus, excellent process performance, etc., and are playing an increasingly important role in modern industry. [0003] Extrusion processing of aluminum alloy, magnesium alloy, titanium alloy and other non-ferrous alloy materials such as pipes, rods, plates and other profiles generally uses cast alloy round rods as the original blank. Extrusion processing adopts the production method of flow operation. Firstly, the cast alloy long bar is subjected to homogenization heat treatment, and then cut to the size of the short bar billet required for extrus...

Claims

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Application Information

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IPC IPC(8): B21C37/00B21C23/00
Inventor 李永兵饶立强邸伟
Owner ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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